Drill



Feb. 24, 1942. J, WOLNY 2,274,023

DRILL Filed July 16, 1940 s Shets-Sheet 2 IN VE TOR.

BYM

A TTORNEYS.

Feb. 24, 1942.

J. WOLNY 2,274,023

DRILL Filed July 16, 1940 5 Sheets-Sheet 3 zfaszepk Wklr y IN V EN TOR.

A TTORNEYS.

Patented Feb. 24, 1942 UNITED STAT-ES OFFICE v v 2.274.023- i DRILL oseph Wolny, Denver, Colo. Application July 16, 1940, Serial No. 345,790

3Claims. (01. 77 -22) This invention aims to provide a novel drill feed and a novel means whereby the drill may be retracted quickly from working position.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With the above and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise emthe rider 3| is supplied with a depending index 33, which, cooperating with a longitudinal scale lower edge of the track 21.

bodiment' of the invention herein disclosed, may

be made within the scope of what is claimed, Without departing from the spirit of the invention.

In the accompanying drawings: v

Fig. 1 shows in elevation, a machine wherein the invention is embodied;

Fig. 2 is a cross section on the line 2-2 of Fig. 1;

Fig. 3 is a cross-section on the line 3-3 of Fig. 1; I

Fig. 4 is-a vertical section showing a part of the drill feed which forms the subject matter of this application.

Fig. 5 is a horizontal section wherein'most parts appear in plan, the view depicting the parts as they will appear whilst the drilling op eration is going on;

Fig. 6 is a view similar to Fig. 5, but illustrating the parts as they will appear whilst a feed of the drill is taking place;

Fig. 7 is a view similar to Figs. 5 and6, but

showing the parts'as they will appear during the operation which consists in retracting the drill.

The supporting; frame shown in Fig. 1 may in clude a base 4, held on a work bench by clamps 2. The work is shown at 6, and is adapted to be perforated by a vertical drill 1, and the base 4 hasan elongated opening 8 which permits the drill 1 to get at the work 6.

Posts I? are located on the base 4. Headed ,studs 22 and 2| are fixed, respectively, in the flange 32 of the rider.

34 on the track 21, makes manifest to the operator, the position to which the rider has been adjusted, lengthwise of the track. The rider 3| is equipped with a lower flange 35, engaging the The lower flange 35 carries perforated ears 33, having nothing to do with the set up shown in Fig. l. The top flange 32 of the rider 3| is supplied with an arm 31 extended lengthwise of the track 21 and provided with an upstanding finger 33, having an inner cam surface 39. The function of the cam surface 39 will bemade manifest hereinafter.

A sleeve 43 is mounted to rotate in the rider or support 3|, although rotation of the sleeve at times is stopped, by a mechanism to be described hereinafter. Downward movement of the sleeve 39;is prevented by a toothed wheel 4|, secured to the upper end of it and disposed above the top The wheel 4| may be regarded as part of the sleeve. Upward movement of the sleeve 43 is prevented by a hand wheel42, secured to the lower end of the sleeve, anti-friction'balls 43 being interposed between the hand wheel and the lower flange 35 of the rider 3|. 1

A screw shaft 44 is threaded into the sleeve 45!, and carries a handle 45' at its upper end. A chuck 46 is secured to the lower end of the shaft 44and carries the drill 1. When the shaft 44 is rotated by the handle 4'5, the drill is rotated, and the drill cooperates with the Work 6. When it is desired that the shaft 44 and the drill I shall feed downwardly, this can be done by holding the wheel 42 in the hand of an operator, the sleeve 40 thus being prevented from turning. The hand feed thus employed is useful, but is not to'the work 6. Another mechanism, next to be described, is employed for feeding the shaft 44 and the drill! downwardly, automatically.

A disk 41 is secured to the wheel 4| and forms an outstanding flange on the wheel. A cross arm 48 is mounted to swing on the screw shaft 44, the edge of the disk 4! being engaged in the cross arm, as shown at 49, on opposite sides of the shaft 44, to hold the cross arm in place. A pawl 50 is fulcrumed intermediate its ends 5| on one end of the arm 48. One end of the pawl 50 has a head 52 shaped to engage the teeth of the wheel 4|.

A dog 53 is connected by a pivot element 54 to the end of the pawl 50 that is remot from the head 52. The dog 53 has teeth 60 for engagement with the teeth of the wheel 4|. A latch 55 is fulcrumed intermediate its ends, at 56, on the arm 48. The outer end of the latch 55 is connected to the dog 53 by a pull spring 51. The inner end of the latch 55 is adapted to engage a shoulder 58, formed by one wall of a longitudinal groove 59 in the shaft 44.

If the parts are disposed as shown in Fig. 5, when the shaft 44 is rotated clockwise, in the direction of the arrow, the latch 55, cooperating with the shoulder 58 in the shaft 44, causes the cross arm 48 to move in the direction of the arrow. The head 52 of the pawl 50 is engaged with the teeth of the wheel 4| and the wheel is caused to rotate clockwise.

tilting of the pawl 59 on the pivot element 5|, the head 52 of the pawl 50 being kept engaged with the teeth of the wheel 4|. When the wheel 4| is rotated, as aforesaid, it turns along with the shaft 44, and the shaft is not fed downwardly, as it is rotated.

As the arm 48 moves clockwise, the knuckle joint at 54, between the dog 53 and the pawl 53, engages the cam surface 39 on the finger 38 of the arm 3! on the rider 3|, the rider being engaged in the track 2! against rotation.

As the knuckle joint at 54 rides along the cam surface 39, the angle between the dog 53 and the pawl 59 is increased, and the pivot element 54 is caused to move inwardly. The pawl 5|] is swung on its fulcrum 5|, and the head 52 of the pawl is swung clear of the wheel 4|, as in Fig. 6.

The wheel 4| thus is uncoupled from the arm 48, so far as getting a clockwise thrust from the pawl 50 is concerned. The sleeve 40 does not receive positive clockwise rotation from the pawl 50, and if the sleeve can be held against rotation due to the friction drag of the rotating screw shaft 44, the screw shaft will be fed downwardly, and the drill of Fig. 1 will be advanced with respect to the work, so long as the knuckle-joint at 54 is in engagement with the cam surface 39.

Reference has been made immediately hereinbefore to the fact that the sleeve 40 should be held against clockwise rotation due to the friction drag of the rotating screw shaft 44. In that connection, note that the teeth 60 of the dog 53 (Fig. 6) remain engaged with the teeth of the wheel 4| whilst the head 52 of the pawl 50 is disengaged from the teeth of that wheel.

As the knuckle joint at 54 moves along the cam surface 39, the knuckle joint is carried inwardly toward the axis of the shaft 44. This gives to the dog 53 a counterclockwise component which substantially offsets the clockwise component due to the fact that the knuckle joint at 54 is moving clockwise along the cam surface 39. The result is that the wheel 4| and the sleeve 40 are held definitely against clockwise rotation, and as the screw shaft 44 is rotated, it feeds downwardly through the sleeve 40. This downward feeding of the screw shaft 44 is of short duration. It continues only so long as the knuckle joint at 54 is riding along the cam surface 39. After the knuckle joint at 54 clears the cam surface 39,

During this opera tion, the dog 53 acts as a brace, preventing the the toothed part 60 of the dog 53, and the head 52 of the pawl are restored to the engaged relation with the toothed wheel 4|, shown in Fig. 5.

When it is desired to retract the screw shaft 44 and the drill the dog 53 is turned outwardly, to the position of Fig. 7, the pull of the spring 51 on the latch being released. C'ounterclockwise rotation, in the direction of the arrow, is imparted to the screw shaft 44, the knuckle joint at 54 ultimately coming into contact with the end 6| of the fixed finger 38. Movement of the arm 49, in a counterclockwise direction, is stopped, and counterclockwise rotation of the sleeve 40 is stopped, because the head 52 of the pawl 50 is engaged with the toothed wheel 4|. The screw shaft 44 thereupon will feed upwardly, raising the drill 1 with respect to the work.

The pawl 59 is provided with an opening 5| for reception of the fulcrum pin 5|. When a more rapid feed of the drill bit is desirable the pawl 50 is mounted with its fulcrum at 5|, thereby lengthening the lever on which the dog 53 is mounted and increasing the travel of the dog.

Having thus described the invention, what is claimed is:

1. In a drill feed, a support, a sleeve mounted to rotate in the support, a drill shaft threaded into the sleeve, means for rotating the drill shaft directly, an arm mounted to swing on the drill shaft, 2. releasable connection between the arm and the drill shaft, a pawl fulcrumed intermediate its ends on the arm, one end of the pawl being engageable with the sleeve to cause the sleeve to rotate directly, with the drill shaft, a dog pivoted to the opposite end of the pawl, the

.pivotally connected ends of the pawl and the dog forming a knuckle joint, means for maintaining the dog yieldably engaged with the sleeve, and a fixed cam wherewith the knuckle joint engages, as the arm travels directly, to move the knuckle joint toward the shaft, thereby to disengage the pawl from the sleeve and to impart to the dog a reverse component, neutralizing the direct component resulting from the travel of the knuckle joint along the cam, the sleeve thereby being held substantially fixed, whereby the drill shaft will feed therethrough, when the drill shaft is rotated directly.

2. A drill feed constructed as set forth in claim 1, and wherein the releasable connection is a shaft-engaging latch pivotally mounted on the arm, the means for maintaining the dog yieldably engaged with the sleeve being a retractile spring connected to the dog and to the latch and constituting assisting means for maintaining the latch engaged with the shaft.

3. A drill feed constructed as set forth in claim 1, and wherein the dog is movable to disengage it from the sleeve, to present the knuckle joint prominently, one end of the cam constituting an abutment wherewith the knuckle joint engages, to stop reverse rotation of the arm and the sleeve, when reverse rotation is imparted to the shaft and whilst the pawl is engaged with the sleeve.

JOSEPH WOLNY. 

